https://what-if.xkcd.com/ https://what-if.xkcd.com/ >> Could I cool down the Earth by capturing a comet and dropping it in the ocean, like an ice cube in a gla

https://what-if.xkcd.com/ https://what-if.xkcd.com/ >> Could I cool down the Earth by capturing a comet and dropping it in the ocean, like an ice cube in a glass of water? > No. In fact, it's honestly sort of impressive to find a solution that would actively make the problem worse in so many different ways. The short answer is, the falling ice adds about 100x as much heat from the difference in potential energy than it cools.